Every time I collect tomatoes in the garden, my hands end up covered with an invisible substance with a pungent smell. It seems to come from the tomato leaves and branches. When I wash my hands with soap, the substance becomes a very bright yellow-green 鈥� almost fluorescent 鈥� and it stains my soap, towel and wash basin. However, if I don鈥檛 use soap to wash the substance off, it remains invisible. What is it?
Alex Saragosa, Terranuova, Italy
